407172009 has 4 divisors (see below), whose sum is σ = 542896016. Its totient is φ = 271448004.

The previous prime is 407171987. The next prime is 407172019. The reversal of 407172009 is 900271704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 407172009 - 2⁸ = 407171753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (407172019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67861999 + ... + 67862004.

It is an arithmetic number, because the mean of its divisors is an integer number (135724004).

Almost surely, 2^407172009 is an apocalyptic number.

It is an amenable number.

407172009 is a deficient number, since it is larger than the sum of its proper divisors (135724007).

407172009 is a wasteful number, since it uses less digits than its factorization.

407172009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135724006.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 407172009 is about 20178.5036362957. The cubic root of 407172009 is about 741.1838907928.

The spelling of 407172009 in words is "four hundred seven million, one hundred seventy-two thousand, nine".